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Volbx is a graphical tool for data manipulation written in C++/Qt. User can load, filter, select, visualize, export data and more using few clicks. Volbx reads, along with inner application format, xlsx and ods spreadsheet files. User can save data set as csv or xlsx and plots as png files. Dynamic and interactive plots can be zoomed, moved, reset to initial state, quickly exported to clipboard and more. Application calculate dynamically handy values as quantiles, standard deviation, average and more for given data set.

This tool was originally created for real estate appraisal to give possibility, for people working in that area, to estimate past, current and future value of analyzed properties. Project/start-up was dropped and decision about release of less specialized application was made by me. Most advanced and dedicated for real estates functionalities were cut out but still some are quite useful.

Built using:

Qt 5.12
QtCreator 4.8.1
Qwt 6.1
QuaZip 0.7.6
MinGW with GCC 7.3.0, 64 bit
Windows 10 v1809
Cmake 3.12.3
Git 2.19.1
Svn 1.11.1
Zlib 1.2.11


Use Cmake directly or via QtCreator. Cmake should:

  • configure everything automatically,
  • download dependencies using Git (QuaZip, Zlib) and SVN (Qwt),
  • build dependencies,
  • compile Volbx and create binaries.

This is of course "happy path" ;)

TIPS: set CMAKE_PREFIX_PATH env variable (should point to Qt) and add qmake location to PATH variable (QWT building expects it).


Volbx can be used using LGPLv3. Volbx uses following software and licenses:

  • Qt, Qwt and QuaZip libraries - LGPL licences (more on, and,
  • Zlib - Zlib license (can be found on


  1. Build target VersionCheck.
  2. Run VersionCheck, following window should be shown:
    Alt text

Setup update server

  1. Get a domain and hosting ;)
  2. Add simple .php file which contains something like this:


foreach (glob("*") as $filename) {
    echo "\n$filename;" . filesize($filename);
  1. Create folder current in directory where PHP file from point above is located.
  2. Add new/other version of Volbx and/or updater in current directory.
  3. Change code of networking module in Volbx to point to proper adress - look for Networking::getCurrentVersionRequest() and QNetworkRequest Networking::getDownloadFileRequest(QString file)
  4. Compile VersionChecker and run it - it should connect to given adress and download content of current folder.


  • Checksum should be used in correctness checks instead of size of files.
  • When I've created VersionChecker I've decided to use simplest solution which I was able to create. I do not know if it is safe and 'proper' enough but it worked :D I'm not web deweloper ;)
  • Windows needs admin rights (as of ~2012) when executing files having in name strings like "update", "install" or "setup". Quite ugly name VersionChecker was picked to workaround that problem.
  • On Windows updater cannot overwrite file which is being used (as of ~2012). There is a special mechanism for replacing used/locked files: closing Volbx, running updater, changing not used/blocked binaries/libs, replacing automatically used/blocked ones during next run of Volbx.


  1. Compile project.
  2. Run target named tests.
  3. Check test output, all tests should have status PASSED.

Tests are done using Qt test framework.

Potential further improvements

  • Clean and simplify whole code (it was created between 2010 and 2013 when I had only few years of experience and veeery little knowledge how good code should look like...). (undergoing)
  • Upgrade whole code to use C++17/C++20 (undergoing)
  • Measure and increase test coverage.

More screenshots:

Alt textAlt textAlt text

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